Improvement in vulcanizing rubber for dental-plates



CYRUS M. KELSEY. "vlmproveme ntin Vulcanizing Rubbers fo'rDen tlPurposes.

No. 121,174 Patented Nov.21,187 1.

1M. fWGTD-LITIIHGHAPII/C m. lineman/1:5 Mon-m CYRUS M. KELSEY, or MOUNTVERNON, onto.

IMPROVEMENT IN VULCANIZING R:UBBER FOR DENTAL-PLATES, &c.

Specification forming part of Letters Patent No. 121,174, dated November21, 1871.

To all whom it may concern.-

Be it known that I, OYRUs M. KELsEY, a citizen of the United States,residing at Mount Vernon, in the county of Knox and State of Ohio, haveinvented an Improvement on my Improved Method of Vulcanizing Rubber forDental and other purposes, patented on the 10th day of August, 1869; andI do hereby declare that the following is a full and exact descriptionthereof, reference being had to the or conductors inside the vulcanizer;the object of which is, first, to prevent the rubber from burning, andto retain, modify, and equalize the heat; and, secondly, to aflord anopportunity to insert a thermometer, by which the exact degree of heatcan be ascertained in and around the flask, substantially in the mannerset forth in my patent of August 10, 1869, with these exceptions: first,the try-piece heretofore used is now omitted; and, secondly, tubes orconductors, and an attachable or detachable reservoir of water, in whichthis improvement substantially consists, are employed to guard against atoo rapid heat at the base of the flaskito produce steam, extreme heator hot air beneath it and around it, when desired; to supply moisture tothe rubber while vulcanizing; and to regulate or modify the heat bysupplying water when needed; and, finally, by connecting said long benttube with a reservoir of water to be heated to any degree desired, andindicated by a thersandjtozthe depth of half an inch, more or less;

then the long bent tube or conductor a, with perforations on the upperside of its base, covered with a perforated plate, and whose endsproject above the cylinder, is put in; then sand is poured in to thedepth of half an inch, more or less; then the flask O is set in, and theshort tubes or conductors b are placed around the flask and down to thebottom of the cylinder; then the flues of the long bent tubeor'conductor a having been closed with caps, corks, or screws, thecylinder is filled with sand the cap or cover put on, and set upon theheater The thermom eter T is then inserted and worked down to the baseof the flask, and jacket E put on; then heat, produced by steam, gas, orany kind of burning-fluid, is applied, ranging from 270 to 350Fahrenheit, according to the different kinds of rubber to be vulcanized.

- The tubes or conductors a and b, which substantially constitute thenew improvement upon my invention patented August 10, 1869, may consistof iron or any other material used as conducting mediums; and water maybe forced in and down the long bent tube or conductor when required byinserting the point of what is usually called an oil-can, c, andpressing on the same, according to the desired degree of heat ormoisture about the flask; or, if desired, hot water or steam may beforced in by extending or connecting the long bent tube to or with areservoir, 1', of water heated to any degree desired, and indicated by athermometer attached, and graduated or determined by means of astop-cock, s, which admits or prevents the same, or the last may bedetached and cold water admitted, as desired.

What I claim as my invention, and desire to secure by Letters Patent,is-

Vulcanizing rubber for dental and other purposes by means of asand-bath, tubes or conductors, and thermometer, substantially as setforth in my patent issued August 10, 1869, omitting only the try-piece,and adding said tubes or conductors, which materially affect andfacilitate the process of vulcanizing rubber in the manner abovedescribed.

But, more specifically:

1. An improvement in the method and manner of vulcanizing India rubber,the use of a sand-bath, combined with a flask, in the manner heretoforeand herein substantially set forth.

at pleasure 4. In combination with a sand-bath and flask for vulcanizingIndia rubber, the employment of a thermometer and tubes or conductors,substantially and particularly in the manner herein de scribed,including also a reservoir of Water, attachable or detachable, combinedwith a heating apparatus and thermometer.

This specification signed and witnessed this 6th day of October, A. D.1871.

CYRUS M. KELSEY.

Witnesses:

B. A. F. GREEK.

W. R. sin, (46)

